Margin Maker 4+

Rieki-chan – Profit Calculator for Sellers

Have you ever struggled to figure out the right price to charge in a flea market, a personal sale, or freelance work?
Worried about how shipping costs or platform fees affect your actual profit?

Rieki-chan is a simple, powerful tool that helps you calculate sales prices, profit amounts, and profit margins — all based on your desired outcome.

Just enter your basic costs (product price, shipping, fees), and you’re ready to go.

### 3 Smart Calculation Modes

**Calculate from Profit Margin**
Want to set a 20% margin on your cost price? It’s usually calculated like: Cost ÷ (100 - Margin) × 100…
But wait — do you include shipping and fees too? With Rieki-chan, just select the “From Margin” tab and input your desired percentage. The app calculates everything for you instantly.

**Calculate from Profit Amount**
Not interested in percentages? You just want a fixed 3,000 yen profit?
No problem. Choose the “From Profit” tab, enter your desired profit, and Rieki-chan instantly shows the ideal sales price.

**Calculate from Selling Price**
Have a fixed selling price in mind?
Select the “From Price” tab and enter your target. You’ll immediately see how much profit you’ll make and what the margin is.

### Compare and Adjust Freely

All three methods are just a tab away. Easily compare options and tweak numbers until they make sense.

You can clear all values with a single tap, and there’s even a smart feature to keep your fee settings when resetting.

### Disclaimer
Calculations may result in slight rounding errors. Please use results as a reference only.

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